In Order to Prevent STDs, the Textbook Mentions All of the Following

In order to prevent STDs, the textbook mentions all of the following EXCEPT

A) Avoid multiple partners.
B) Inspect your partner's sex organs before sexual contact.
C) Abstain from sexual contact if you have doubts about potential harmful effects.
D) Use "natural" condoms, such as those made from lamb skin.
E) Get regular medical check-ups to detect disorders you may not be aware of.